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tanx = sinx/cosx & sin²x + cos²x = 1
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Covers most Maths topics in Secondary High Schools

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Resources used with students studying Maths in Scottish Secondary Schools

## Trig Identities

Understanding Trig Identities is important to ensure your success in tests, assessments and exams.

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Trig Identities Worksheet & Solution – HERE

They are equations which use sine, tan and cosine.

An identity with x as a variable is a formula that is true for all values of x.

In tests, assessments and exams you may asked to prove that the left hand side of an equation is the same as the right hand side of the equation.

There are two Trig Identities which you are expected to know:

• tan x = sin x/cos x
• sin² x + cos² x = 1

Example:

• Prove that sin³ x + sin x cos² x = sin x

Solution:

1. Remove common factor: sin x (sin² x + cos² x) = sin x
2. Substitute sin² x + cos² x = 1 into the above:
3. sin x ( 1 ) = sin x
4. sin x = sin x

## Study Guides

We cover everything you need to know about Trig Identities in the Study Guides.

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### N5 Maths - Whole Course Page

Past/Practice Exam Papers, Theory Guides, Worksheets, Starter Questions, Mind Maps, PowerPoints, Videos, Exam Focused Study Pack ...

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Past/Practice Exam Papers, Theory Guides, Text Book Solutions, Starter Questions, Mind Maps, Videos, Exam Focused Study Pack ...

### N5 Lifeskills Maths

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## Not just Trig Identities, but 70 other maths concepts covered in detail

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